Gas burning apparatus



Aug. 28, 1945.

r. B. FocKEE-rm.

GAS BURNING APPARATUS 6, 1941 2 Sheets-Sheet' 1 Filed 061',

u Patented Aug. 2K8, 1945 f GAs BURNING APPARATUS Theodore B. Focke, cleveland Heights, John Alger Dahlstrom, Bay Village, and Joseph R. Kirk.- patrick, South Euclid, Ohio, assignors to Perfection Stove Company, Cleveland, Ohio, a corporation of Ohio Application October 6, 1941, Serial No. 413,728

4 Claims.

This invention relates to gas burning apparatus, and its primary object isto provide a burner that is peculiarly suited for use in automatically controlled domestic gas furnaces or the like,

wherein the quantity of gas supplied to the ence to the physics of the burner is the proper spacing of the discharge endof the inner nozzle from that of the outer nozzle. The drawings show a practical and satisfactory arrangement,

5 although reasonable tolerance may be permitted burner is under'the control of a room thermoin both directions therefrom. However, the Statparts must be so proportioned and arranged in Another object is to provide an automatically this respect that gas issuing from the inner controlled multiple -gas burner system that opnozzle will not create any perceptible aspirating crates smoothly, eiliciently and economically, effect or back pressure within the outer nozzle. and that requires the minimum number of auto- As proven by actual test, these conditions may matically operated valves. f be attained by following the shape, proportion More limitedly, the purpose of the invention and relation of parts illustrated in Fig. 1. Furls to provide a two-stage gas burner of relatively ther reference to this phase of the subject will simple design and construction; that is economhereinafter appear. Notwithstanding similarity ical o1' production; that is adapted to standard in design, the present two-stage burner should` methods of installation, and which affords the not be confused with. injector Aburners wherein advantages already stated with others hereinan impelling uid, Such aS Steam, air 01 other after appearing. A gas, is used. In other words, the present invenlln the accompanying drawings, Pig. l is a tion is concerned only with atmospheric gas central longitudinal section through one form of burnersthe multiple nozzle of the two-stage burner and In Fig- 3,12W0 burners are ShOWIl, the Same bethe adjacent part of the mixer or Venturi tubeing designated generally, by the reference nuof the' burner; Fig. l2 is a section on the line merals I5 and I6, respectively, The bodies of 2-2 Vof Fig. 1 Fig. 3 is a diagram illustrating an 25 these burners may be of usual character, conautomatically controlled multiple burner system sisting 0f hOllOW Castings or the like, and they embodying the invention, and Fig. 4 shows a, are shown as provided with lateral extensions part of such a system incorporating a modiiics.- I5a and ISB, respectively, that lead toward a tion of the multiple nozzle. l common igniter or pilot burner Il. As indi- A vital part of our invention themultiple 3o cated. the pilot burner emits two iets, 011e tonozzle illustrated in detail in Figs. l and 2, and ward each of said extensions. The mixture of included in modied form in Fig. 4. Accordair and gas is supplied to the burner I5 lthrough -ins to Figs. 1 and 2, it comprises an outer nozzle the previously mentioned mixer or Venturi tube i into the internally threaded forward.v end of I5, and tothe burner I6 through a mixer or Venwhich is screwed a tip 2 having a relativelyA small.- 35 turi -tube I8 into the receiving end .of which is central orice 3. Following common practice, projected a nozzle I9, similar to the outer nozzle the exterior of the nozzle I is threaded and is I of our two-stage burner, and on which is screwed through the central boss 5 of a mixer threadedly mounted a disk-like damper 20. Thel or Venturi -tube 6. The air supply to the mixer nozzle I9 has a lateral inlet extension 2l. This or Venturi tube 8 is controlled, in the present in- 4o and the extension 9 of the nozzle I of our two-l `stance. by a disk-like damper 8 that is threaded stage burner have connection, through unions on and, therefore. adjustable along thei nozzle I 22, with a branched pipe or conduit 23 that leads toward and from the entrance end of said tube. from a solenoid valve 25. A second solenoid valve Adjacent its rear en d, the nozzle I has a lat- 26 communicates, through a conduit or pipe 2l eral, externally threaded extension 9. Ar- 45 and the previously mentioned fitting I2, with the ranged within and substantially axially of the inner nozzle .I0 of the two-stage burner, the conouter nozzle Iv is an inner nozzle ,IIl having `an nection between said pipe or conduit and the orice II at vits forward end that is approxilateral extensiony I3 0f Said fitting l2 being efmately in axial augment with the previously footed through a union 28- Gas iS Supplied t0 mentioned'orince 3. The nozzle I0 is carried by 5o the valves 25"and 26 through the respective pipes a nttlng I2, shown in the form of an L, the or conduits 30 and 3| that lead, through a pipe lateral extension of which ls designated I3. The section 32,' containing a pressure regulator 33 forward end of said fitting is threaded' and is and a manually operated main valve 34, from a screwed into a threaded opening in the rear endv gas supply pipe 35. Gas from the'main supply in ot the nozzle I. An important factor with -referadvance of thevalve 34 is conducted through a v wisedirectionand 1 shutting oi!- the pipe 3l to the pilot burner I1, said pipe containinga valve 39. The valves 25 and 2i are biased toward closed position, as by springs (not shown). Y Y

The windings of the solenoids of the respective valves 2i and 2i are designated 4|! and 4I. 42 is a room thermostat having a blade 43, and a leaf spring 44 that is carried bythe blade. A' conductor 45, that represents one sidev of an electric circuit, is connected to the room thermostat 42, thereby to supply current to the blade 43 and the spring 44. The spring 44 is arranged for engagement with a. contact 46 from which a conductor 41 leads to one end of the solenoid winding 4I,

the opposite end of which winding is connected,

through a conductor 44, with a conductor 4S that represents the opposite side o! the circuit. The

blade 43 is arranged for engagement with a contact 5l that is connected, through a conductor il, with one end of the solenoid winding 4I, the opposite end of which has connection, through the conductor 52, with the previously mentioned Y conductor 4l.

In considering the operation of the multiple Vburner system', it willbev assumed that the manually operated valve 34 is open. Y,As the parts are illustrated inFig. 3, both solenoid valves 2i and 26 are closed and only the pilot burner I1 is in operation to p ect a jet of name toward each of the burner e ons II* and Ill, they valve I9. being adjusted toeiiect igniting lets of the desired size. As usual in such systems, the room thermostat 42 is set to maintain a given temperature value within relatively close limits, and f in case of a dropin the temperature below said value, the blade 43 is caused to swing in a clockwise direction and engage the spring 44 with the contact 46, thereby permitting current to iiow from thesource through theV conductor 45, thermostat 42, spring 44 and conductor", to thejsolenoid winding 4I, and thence through conductors 48 and 49, back to the source. The

, solenoid of valve 24 Vbeing thus energized, the

ignited from the pilot burner I'I andthe burner will operateV at what may be considered low fire, such being the capacity of the inner nozzle III. II the low is sumcient to raise the temperature aiecting the room. thermostat 42 enough to causethe blade 43 t'o swing in a counter-clockwithdraw the spring `44 irom the contact 46, the solenoid winding 4I will be in the branch IS, whereupon the gas will be deenerglzed and the valve 2i will close, thus gas supply to the banner li. 0n the other insuilicient to raise the room temperature tothe predetermined value at which the room-thermor stat is set, the blade 43 will continue to move in aclockwlse direction (thespring 44 yieldingto the excess movement of the blade) until the valve 25 energized, said valve will open und Pel'- 15 hand,` should the heat output olfA the two-stage burner, operating at low ilre, be

- tion shown Obviously, a slight indication oi -as' Since the two-stage burner was previously operating throughout the area thereof at the vcapacity of nozzle I0,.the present eilect will be the same as turning up the two-stage burner to high iire, and at the same time the -output of the apparatus will be stepped up by the full capacity of the burner I6. The apparatus will continue to operate at high iire until the temperature a!- tectingthe thermostat 42 rises sulllciently to cause the withdrawal of the blade 43 from the contact '50, thereby to reduce the apparatus to low tire, and in case the temperature continues to go up, the spring 44 will withdraw from the contact 4B, causing the valve 26 to close, resulting in discontinuance of the iire. A

Obviously, the capacity of the system may be increased by extending that branch of the pipe or conduit 23 to which the burner I6 is connected, and duplicating or multiplying `said burner and its connection with said pipe or conduit.

' As above pointed out with respect to the multiple nomle, illustrated in detail in Figs.y 1 and 2, it is important that the inner and outer nozzles be so related that gas issuing from the inner nozzle will not create any perceptible aspirating effect or back pressure within the outer nozzle. .As-previously stated, this result is obtained by. following reasonably closelythe construction illustrated in the drawings. Substantial deviations therefrom result in certain adverse effects. For example, ii the orifice Il oi the inner nozzle is vtoo close to the orifice 3 of the outer nozzle, and gas is issuing from the inner nozzle only, an aspirating eiiect is produced that will draw a suicient quantity or air cult or impossible the ignition of the latter burner. On the other hand, if the relative lengths of the inner and outer nozzles are such as will separate their respective orifices Il and 3 by too great a distance, a back pressure will build up in the outer nozzle that will cause someof the gas to escape through the nozzle I9 of the burner I6 with obvious undesirable consequences. Changes in the size of the oriilces will require a. diierent spacing between them, the

larger the oriiices the greater the distance, s0

that no lixed rule can-be formulated to govern.V

the proportion and relationof the parts; but it may be said that with thelength of one of the nozzles and the size of the orifices Vof both de. cided upon, the other nozzle may be made of a length that' will 4so space its orifice from that of the other that a very slight aspirating edect will be discernible, as at the nozzle I9 in the installapiration is preferable to none at all, as it insures against any possible back pressure that would result* in the escape ofgas; yet the aspirating ellect is so slight as to avoid such leanness of the mixture as would interfere withignition, It l may further be pointed out thatthe distance blade engages the contact il, whereupon current 7 cial tolerances.

between the -orliices or the two nozzles is not a 'critical one, requiring une adjustment, but is Y readily obtainable well within practical, commer- Tendencies toward suction or backpressure are entirely avoided in the form of multiple nozzle illustrated in Fig. 4. A

. Except for the multiple nozzle, Fig. 4 is intended to illustrate a part of a system identical with that shown in Fig. 3. Accordingly, allparts appearing in Fig. 4 that are the same as those appearing in Fig. 3 will be designated by like reference numerals, augmented by the exponent a.

Referring to Fig. 4, the multiple nozzle, designated generally by the reference numeral 6G, is shown as T shaped, and the branch 6I' that corresponds to the stem of the T is externally threaded and screwed through the central boss 5a of the mixer orjVenturi tube E that leads to the burner I 5. By a central longitudinal'partition 62, the interior of the multiple nozzle is divided into ducts or passageways 63 and 64, the former coresponding to the bore or duct of the outer nozzle' I, and the latter to the'bore or duct ofV the inner nozzle l0,`oi the previously described form of the multiple nozzle. 'I'he front wall of the branch 6l is provided with oriiices 65 and 68 through which the gas issues `from the respective ducts or passageways 63 and 64.

The gas is supplied to said passageways through the respective lateral hollow bosses or extensions 61 and 68 which together comprise the part of the structure that corresponds to the cross of the "T. Connected tothe extension 61, by a union latter of which includes a. pressure regulator 33B.'

The supply of air to the mixer or Venturi'tube 6 is controlled by a damper 8a that is threaded upon and adjustable along the branch 6l oi the multiple nozzle 60. y

The operation of the system involving the modifled form of the multiple nozzle will he readily 'understood from that of the for@` previously described.

Having thus claim is: l

l. In a. system of the class described, a plurality/of atmospheric gas burners, one of "the,

burners including two gas nozzles, a common source of gas supplyfor the plurality of burners,

two branch conduits leading from said source, the first of said branch conduits communicating exclusively with one .of the aforesaid gas nozzles and the second communicating with the other gs nozzle and with the remaindergof the burnersa valve in each branch conduit, and means for either operating the valve in the first-branch conduit only, or for operating the valves in both branch conduits simultaneously.

2.In a system of the class described,-a pludescribed our invention, what wel burners incorporating a mixing tube and a dual passage gas nozzle that discharges into said tubes,

a source of gas supply common to the plurality of burneratwo branch conduits leading from said source, the rst branch conduit communicating exclusively with one passage ofgthe aforesaid gas nozzle and the second branch conduit communieating with the other passage ofsaid nozzle and with the remainder of the burners, a valve'in each branch conduit, and means for either operating that valve which is in the rst mentioned branch conduit only, or for operating the valves in both branch conduits simultaneously.

. 3. Inv a system of the class described, a plusource, the ilrst branch conduit communicating exclusively with one passage of the aforesaid gas nomle and the second branch conduit communicating with the other passage of said gas nozzle and with the remainder of the burners, two valves,

one in each branch conduit, two electrical devices, one for operating each of said valves, a room thermostat incorporating two sets of contacts that operate in avgiven sequence, a circuit including one set of contacts and one of said electrical devices, another circuit including the other set of contacts and the second of said electrical devices, and means for igniting the burners.

4. In a system of the class described, a plurality of atmospheric gas burners, one of said r burners incorporating a mixing tube and a dual of burners,

passage gas nozzle that discharges into said tube, a source of gas supply. common to the plurality two branch conduits leading from said source, the rst branch conduit communi- 'eating exclusively with one passage of the aforesaid gas .nozzle and the second branch conduit communicating with the other passage of said gas nomle and with the remainder of the burners, two valves, the rs't in the iirst branch conduit and the second in the second branch conduit, two the first for operating the first,

electrical devices,

valve and the second for operating the second valve, a room'thermostat incorporating a iirst and a second set of contacts that close inthe order named as the thermostat operates in response to igniting the burners.

a drop in temperature and that open in reverse order as the thermostat operates in response to a rise in temperature, a circuit including the first set of contacts andthe rst electrical device, an'- other circuit including the second set of 'contactsl and the second electrical device, and means for 'nmoDoRa B. room. JOHN ALGER mms'raoM.

JOSEPHv R. mKPA'I'RICK.

rality of atmospheric gas burners, one of the 

